// this is just me making a add vec func where
// it retains the order for add or subtracting
// and vec1 and vec2 can be different sizes
fn add_vec(vec1: &Vec<i32>, vec2: &Vec<i32>) -> Vec<i32> {
    //return vec![vec1[0]+vec2[0],vec1[1]+vec2[1]];
    let mut len=vec1.len();
    let mut sumvec: Vec<i32> = vec1.to_vec();
    let addvec: Vec<i32> = vec2.to_vec();
    if vec1.len() < vec2.len() { 
        len = vec2.len();
    }

    for i in 0..len {
        if let Some(_) = vec2.get(i) {
            if let Some(_) = vec1.get(i) {
                sumvec[i] = sumvec[i] + addvec[i]
            } else {
                sumvec.push(vec2[i])
            }
        }
    }

    return sumvec;
}

fn sub_vec(vec1: &Vec<i32>, vec2: &Vec<i32>) -> Vec<i32> {
    let mut len=vec1.len();
    let mut sumvec: Vec<i32> = vec1.to_vec();
    let addvec: Vec<i32> = vec2.to_vec();
    if vec1.len() < vec2.len() { 
        len = vec2.len();
    }

    for i in 0..len {
        if let Some(_) = vec2.get(i) {
            if let Some(_) = vec1.get(i) {
                sumvec[i] = sumvec[i] - addvec[i]
            } else {
                sumvec.push(vec2[i])
            }
        }
    }

    return sumvec;
}

fn main() {
    println!("{:?}", add_vec(&vec![2,4, -1, 4, 10], &vec![1,-1,-4]));
    println!("{:?}", add_vec(&vec![1,1], &vec![1,-1,-4,3]));
    println!("{:?}", sub_vec(&vec![2, -1], &vec![1,1,-4]));
}